RockJock RJ-144100-101 Front 3.5in Lift Coil Springs for 2018-2024 Jeep JL

Vehicle Fitment

• 2018-2024 Jeep Wrangler JL Unlimited (4-door) - 3.6L V6, 4WD; front suspension
• 2018-2024 Jeep Wrangler JL Unlimited (4-door) - 2.0L Turbo I4, 4WD; front suspension

Fitment Notes

• Position: Front.
• Provides approximately 3.5 inches of suspension lift.
• Designed specifically for JL Wrangler Unlimited 4-door models with 3.6L V6 or 2.0T I4 gasoline drivetrains.
• Not intended for EcoDiesel, 392 HEMI or 4xe Hybrid drivetrain applications.
• Intended for use with factory upper and lower coil spring isolators.
• RockJock recommends appropriate bump-stop extensions with these springs.
• Actual lift height can vary according to factory vehicle specifications and the weight of aftermarket equipment.
• Compatible with RockJock Johnny Joint suspension systems and other manufacturers' 3-5 inch lift systems.
• Not a complete suspension lift kit; rear coil springs, shocks, control arms and other suspension components are not included.
• 2025 and 2026 fitment was not sufficiently confirmed for this exact spring application and is therefore not listed.

Features

• RockJock-spec dual-rate front coil spring design.
• Provides approximately 3.5 inches of front suspension lift.
• Soft initial spring rate improves small-bump and trail-chop compliance.
• Firmer secondary rate helps absorb larger impacts and reduce bottoming.
• Dual-rate crossover is positioned to retain part of the softer rate at ride height.
• Designed for increased off-road suspension flex.
• Maintains a comfortable on-road ride while increasing suspension travel.
• Directly replaces factory front coil springs.
• Compatible with RockJock Johnny Joint suspension systems.
• Can be used with other manufacturers' 3-5 inch lift systems.
• Designed around factory coil spring isolators.
• Gloss-black powder-coated finish provides a durable protective surface.

Specifications

• Brand: RockJock
• Part Number: RJ-144100-101
• Product Type: Front Coil Springs
• Position: Front
• Lift Height: 3.5 inches
• Spring Type: Dual-Rate Coil Spring
• Application: Jeep Wrangler JL Unlimited 4-Door
• Engine Compatibility: 3.6L V6 and 2.0T I4 gasoline engines
• Drivetrain: 4WD
• Spring Free Length: 20.000 inches
• Finish: Gloss Black Powder Coat
• Installation: Direct Factory-Spring Replacement
• Quantity: Pair

Included Components

• 2x RockJock RJ-144100-101 3.5-inch Lift Front Coil Springs

Product Description

The RockJock RJ-144100-101 is a pair of 3.5-inch lift front coil springs engineered specifically for four-door Jeep Wrangler JL Unlimited models equipped with the 3.6L V6 or 2.0T I4 gasoline drivetrain. RockJock's dual-rate spring design uses a softer initial rate to absorb small bumps and trail chop, followed by a firmer secondary rate to better control larger impacts and reduce suspension bottoming.

These front springs directly replace the factory coil springs and provide approximately 3.5 inches of front suspension lift. The crossover point is positioned so that part of the softer spring rate remains active at ride height, helping balance on-road ride quality with increased off-road articulation. Each spring has a 20.000-inch free length and a gloss-black powder-coated finish.

RJ-144100-101 is intended for use with factory upper and lower coil spring isolators and can be paired with RockJock Johnny Joint suspension systems or other manufacturers' 3-5 inch lift systems. The springs are specifically excluded from EcoDiesel, 392 HEMI and 4xe Hybrid applications, which require different RockJock spring part numbers. Actual lift height may vary depending on factory vehicle specifications and additional vehicle weight.